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At follow-up was again found that children exposed to polluted air developed more slowly than the other children, closing the gap between the children thus increased.The studyMore than cognilift 2000 children aged between seven and ten years from 39 schools in Barcelona were tested every three months and a year. The schools had similar socio-economic status, a factor which already proved that it has an impact on cognitive development. Also quality of education that "identical". After one year it was done a follow-up testhttp://www.x4facts.com/cognilift/